add description all the way

pkg/cart/cart-grain.go

@@ -92,10 +92,12 @@ type CartGrain struct {
 }
 
 type Voucher struct {
-	Code  string   `json:"code"`
-	Rules []string `json:"rules"`
-	Id    uint32   `json:"id"`
-	Value int64    `json:"value"`
+	Code        string   `json:"code"`
+	Applied     bool     `json:"applied"`
+	Rules       []string `json:"rules"`
+	Description string   `json:"description,omitempty"`
+	Id          uint32   `json:"id"`
+	Value       int64    `json:"value"`
 }
 
 func (v *Voucher) AppliesTo(cart *CartGrain) ([]*CartItem, bool) {
@@ -270,13 +272,15 @@ func (c *CartGrain) UpdateTotals() {
 		c.TotalPrice.Add(delivery.Price)
 	}
 	for _, voucher := range c.Vouchers {
-		if _, ok := voucher.AppliesTo(c); ok {
+		_, ok := voucher.AppliesTo(c)
+		voucher.Applied = false
+		if ok {
 			value := NewPriceFromIncVat(voucher.Value, 25)
 			if c.TotalPrice.IncVat <= value.IncVat {
 				// don't apply discounts to more than the total price
 				continue
 			}
-
+			voucher.Applied = true
 			c.TotalDiscount.Add(*value)
 			c.TotalPrice.Subtract(*value)
 		}